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diff --git a/layout/reftests/async-scrolling/position-fixed-async-zoom-1.html b/layout/reftests/async-scrolling/position-fixed-async-zoom-1.html
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+++ b/layout/reftests/async-scrolling/position-fixed-async-zoom-1.html
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+<!DOCTYPE html>
+<html reftest-async-scroll
+      reftest-displayport-x="0" reftest-displayport-y="0"
+      reftest-displayport-w="800" reftest-displayport-h="1000"
+      reftest-async-scroll-x="0" reftest-async-scroll-y="50"
+      reftest-async-zoom="2.0">
+<head>
+  <style>
+    html {
+      scrollbar-width: none;
+    }
+    body {
+      height: 3000px;
+      margin: 0;
+    }
+    div {
+      position: fixed;
+      top: 0;
+      width: 100px;
+      height: 100px;
+      background: green;
+    }
+  </style>
+</head>
+<body>
+  <!-- Test that position:fixed elements are attached to the layout viewport
+       instead of the visual viewport.
+
+       An async scroll of 50 CSS pixels will scroll the visual viewport by 100
+       screen pixels (since async zoom is set to 2.0) and result in the top
+       half of the div being scrolled out of view. -->
+  <div></div>
+</body>
+</html>